chore(deps): update dependency @sourcegraph/tslint-config to v12

Author: renovate-bot

Diff for: package-lock.json

@@ -39,7 +39,7 @@
   },
   "devDependencies": {
     "@sourcegraph/prettierrc": "^2.0.0",
-    "@sourcegraph/tslint-config": "^11.1.0",
+    "@sourcegraph/tslint-config": "^12.0.0",
     "@types/chai": "^4.1.3",
     "@types/chai-as-promised": "^7.1.0",
     "@types/del": "^3.0.1",